Magnetic Field Strength
The magnetic field strength associated with a rotating superconductor is given by:
where M and Q are the mass and the charge of the superconducting charge carriers respectively. For the case of Cooper pairs of electrons, M=2me and Q=2e. Despite the electrons existing in a strongly-interacting environment, me denotes here the mass of the bare electrons (as in vacuum), and not e.g. the effective mass of conducting electrons of the normal phase.
Read more about this topic: London Moment
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The Book of Common Prayer (1662)